Macro nedeed
 

How its the macro for pressing a button in the action bar?

no makro needet.. /options/keybindings.. set your key..
are you a clicker ? x.X

Hot for clicker, i wanted to make some combos.

There is no way to macro an action bar command that I know of however, the same effect can be archived with macros.

/cast spell
/equip item
/use 13 - top trinket spot
/use 14 - bottom
/use [target=player] item

ect.